98298 hdl_2072_13171 oai:www.recercat.cat:2072/182666 Relevant market definition is still a key element of economic analysis of competition in the gasoline market. It is particularly difficult to handle when competition is local and market power is geographically constrained like is the case in the gasoline market. We analyse how the application of the hypothetical monopolist or Small but Significant Non-Transitory Increase in Prices (SSNIP) test performs for defining isochrones using only information on prices and distance among competitors. We conclude that geographic information systems can be very successfully used to define more precisely relevant geographic market in the gasoline retailing. The application to the Spanish gasoline market concludes that geographic relevant market is composed by 5-6 minutes of travel time. Localised market power should be taken into account when analysing the adverse effects of mergers and entry regulations in gasoline retailing. Only drawing small enough isochrones will drive competition in local markets because it is just close rivals that compete effectively with each other. eng Perdiguero, Jordi Borrell, Joan-Ramon Xarxa de Referència en Economia Aplicada (XREAP) Xarxa de Referència en Economia Aplicada (XREAP) 2012 Driving competition in local gasoline markets 32 p. L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons: http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess 33 332 Gasoline Competition Pricing Geographic information systems Gasolina Competència econòmica Preus Sistemes d'informació geogràfica info:eu-repo/semantics/workingPaper XREAP ; 2012-04 http://ddd.uab.cat/pub/estudis/2012/hdl_2072_182666/XREAP2012-04.pdf 208427 34 Adreça alternativa http://hdl.handle.net/2072/182666 ESTUDIS UAB driver oai:ddd.uab.cat:98298